From: "Cohen, Eugene" <eugene@hp.com>
To: Leif Lindholm <leif.lindholm@linaro.org>,
Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: "edk2-devel@lists.01.org" <edk2-devel@lists.01.org>
Subject: Re: [PATCH] ArmPlatformPkg: remove EFI_MEMORY_UC attribute from normal memory
Date: Thu, 8 Sep 2016 17:37:13 +0000 [thread overview]
Message-ID: <AT5PR84MB029171BC03EA00A9EBE43193B4FB0@AT5PR84MB0291.NAMPRD84.PROD.OUTLOOK.COM> (raw)
In-Reply-To: <20160908092153.GH16080@bivouac.eciton.net>
> I think this is the right thing to do; Arguably, on the modern ARM
> architectures, UNCACHEABLE and WRITE_COMBINEABLE are mutually
> exclusive. I'll discuss with Charles whether we should codify this in
> the UEFI specification.
Given the corresponding X86 semantics it makes sense for UNCACHEABLE to map to Strongly Ordered and WRITE_COMBINEABLE to map to "Normal" Uncacheable. It's useful to expose this separately in case a DMA common buffer has semantics that require the strongly ordered behavior.
Since this is providing a list of capabilities I'm not sure what the statement about mutual exclusivity refers to.
Eugene
next prev parent reply other threads:[~2016-09-08 17:37 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-09-08 8:13 [PATCH] ArmPlatformPkg: remove EFI_MEMORY_UC attribute from normal memory Ard Biesheuvel
2016-09-08 9:21 ` Leif Lindholm
2016-09-08 9:39 ` Ard Biesheuvel
2016-09-08 17:37 ` Cohen, Eugene [this message]
2016-09-08 20:54 ` Leif Lindholm
2016-09-08 17:33 ` Cohen, Eugene
2016-09-08 17:49 ` Ard Biesheuvel
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